282Administering volumes

Adding traditional DRL logging to a mirrored volume

where each bit represents one region in the volume. For example, the size of the log would need to be 20K for a 10GB volume with a region size of 64 kilobytes.

For example, to add a single log plex for the volume vol03, in the disk group, mydg, use the following command:

#vxassist -g mydg addlog vol03 logtype=drl

When the vxassist command is used to add a log subdisk to a volume, by default a log plex is also created to contain the log subdisk unless you include the keyword nolog in the layout specification.

For a volume that will be written to sequentially, such as a database log volume, include the logtype=drlseq attribute to specify that sequential DRL is to be used:

#vxassist -g mydg addlog volume logtype=drlseq [nlog=n]

Once created, the plex containing a log subdisk can be treated as a regular plex. Data subdisks can be added to the log plex. The log plex and log subdisk can be removed using the procedure described in “Removing a traditional DRL log” on page 282.

Removing a traditional DRL log

Note: The procedure described in this section removes a DRL log that is configured within a dedicated DRL plex. The version 20 DCO volume layout includes space for a DRL log.

To remove a DRL log, use the vxassist command as follows:#vxassist [-g diskgroup] remove log volume logtype=drl [nlog=n]

By default, the vxassist command removes one log. Use the optional attribute nlog=n to specify the number of logs that are to remain after the operation completes.

You can use storage attributes to specify the storage from which a log is to be removed. For example, to remove a log on disk mydg10 from volume vol01, enter:

# vxassist -g mydg remove log vol01 !mydg10 logtype=drl